The 1992 BTCC tape has some footage of the E30 in privateer hands, but this was the year that the main teams began using the E36 shells.

The 1991 BTCC tape has some excellent footage of the E30 M3 in action (my favourite is the in-car shots of Steve Soper at Oulton Park - I wish I could drive my M3 half as good!)

Of the German DTM tapes I would recommend the 1990 and 1991 as superior for coverage of the Sport Evo - 1992 isn't quite as good but worth it for capturing the final season of the E30, including winning the last 2 races.

If anybody knows of anything from 1989 DTM pass it on - its the year they won.